Beer is about 5%, so 14 times 20 = 280ml of beer, pretty standard beer glass size

Liquor is around 40% alcohol, and a shot is supposed to be 1.5 oz, so 17g. A bit more than a standard drink, but not far off.

> a shot is supposed to be 1.5 oz

There is no standard definition of a shot. Serves in the US will vary wildly, as will serves across Europe.

In Australia, a shot is 30ml (close enough to 1 oz to make no difference) which is exactly one standard drink or 10g of alcohol, assuming straight spirit.

There's a bar I used to go to that has Whiskey Wednesdays. They're entire whiskey menu was half off. What they don't tell you (unless you ask) is they pour 1 oz shots instead of 1.5.

In Britain the standard glass size is 568 ml, i.e. a pint.

Having not traveled to the UK, is a half pint not also a fairly standard size?

Pubs in Melbourne generally serve pints and "pots", aka half-pints.

You can buy beer in halfs, but people more usually buy a pint.

That's about two drinks, then.

12 oz of 5% alcohol by volume water (let's say beer) has what mass of alcohol?

0.05 * (12 oz * ~30 mL/oz * ~800 mg alcohol / mL) = ~14 grams alcohol

If it’s prepackaged (not from a tap), it’ll say on the packaging how many standard drinks it is.